I understand that you're having trouble with the LTE module on your Latitude 7280. Here are some troubleshooting steps that you can try:

1. Check the hardware: Make sure that the LTE module is properly seated in the slot. You can also try reseating the module to see if that fixes the issue.
2. Update the drivers: Make sure that you have the latest drivers for the LTE module installed. You can download the drivers from the Dell website.
3. Run the Dell Command Update tool: This tool will scan your computer for outdated drivers and install the latest versions.
4. Reset the network adapter: You can reset the network adapter by following these steps:
   • Open Device Manager.
   • Expand the Network adapters category.
   • Right-click on the network adapter and select Properties.
   • Click on the Advanced tab.
   • Scroll down to the Reset section and click on the Reset button.
5. Contact Dell support: If you've tried all of the above steps and the issue is still not fixed, you can contact Dell support for further assistance.

Here are some additional resources that you may find helpful:

• Troubleshooting Dell Latitude 7280 LTE: https://www.dell.com/support/kbdoc/en-us/000123861/dell-mobile-broadband-wwan-module-how-to-identify-and-resolve-a-module-not-detected-issue-on-a-re-imaged-dell-pc
• How to update drivers on your Dell computer: https://www.dell.com/support/kbdoc/en-us/000123861/dell-mobile-broadband-wwan-module-how-to-identify-and-resolve-a-module-not-detected-issue-on-a-re-imaged-dell-pc
• How to reset your network adapter: https://www.dell.com/support/kbdoc/en-us/000123861/dell-mobile-broadband-wwan-module-how-to-identify-and-resolve-a-module-not-detected-issue-on-a-re-imaged-dell-pc

I hope this helps!

That laptop is four years old, so I assume that you bought it used. Are you certain that it has a WWAN card? On many Dell laptops, WWAN is an option, so the original purchaser may not have selected that option. That would explain why it is not detected by Device Manager.

You could open the laptop to verify the existence of a WWAN module or not.

For internal WWAN cards, this Dell page has information.

Whenever touching components or working inside a computer, wear a grounded wrist strap, also called anti-static wrist strap, ESD wrist strap, or ground bracelet. It's a cheap and sensible precaution. Rest the laptop on an anti-static mat or at least a reasonable alternative such as corrugated cardboard. (Repeatedly touching a metal case part is not sufficient mitigation with modern components.)